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    width: 400px;
    display:flex;  /*弹性盒子*/
    justify-content: space-between;  /*两端对齐，子元素之间有间隙*/
    flex-flow: row wrap;/*子元素溢出父容器时换行*/
&#125;
span &#123;
    width: 100px;
    background-color: green;
    color:#fff;
    border-radius: 5px;
    margin-top: 10px;
    padding: 10px;
&#125;
</code></pre>
<img src="https://s1.ax1x.com/2022/10/09/xJgGGj.png">

<p>解决方法：追加一个空的子元素</p>
<pre><code>.wrap:after &#123;content: &quot;&quot;; width: 120px; &#125; 
</code></pre>
<img src="https://s1.ax1x.com/2022/10/09/xJgwZT.png">

<h3 id="flex弹性布局学习总结"><a href="#flex弹性布局学习总结" class="headerlink" title="flex弹性布局学习总结"></a><a target="_blank" rel="noopener" href="https://www.cnblogs.com/nuannuan7362/p/5823381.html">flex弹性布局学习总结</a></h3><img src="https://s1.ax1x.com/2022/10/09/xJgfeK.png">


<p>使用flex布局的容器（flex container），它内部的元素自动成为flex项目（flex item）。容器拥有两根隐形的轴，水平的主轴（main axis），和竖直的交叉轴。主轴开始的位置，即主轴与右边框的交点，称为main start；主轴结束的位置称为main end；交叉轴开始的位置称为cross start；交叉轴结束的位置称为cross end。item按主轴或交叉轴排列，item在主轴方向上占据的宽度称为main size，在交叉轴方向上占据的宽度称为cross size。</p>
<p>此外，需注意使用flex容器内元素，即flex item的float，clear、vertical-align属性将失效。</p>
<p><a target="_blank" rel="noopener" href="https://imgse.com/i/xJ2nfJ"><img src="https://s1.ax1x.com/2022/10/09/xJ2nfJ.png" alt="xJ2nfJ.png"></a></p>
<h3 id="容器属性详述"><a href="#容器属性详述" class="headerlink" title="容器属性详述"></a>容器属性详述</h3><p>1.flex-direction</p>
<p>决定主轴的方向，即项目排列的方向，有四个可能的值：row(默认)|row-reverse|column|column-reverse</p>
<p>row:主轴为水平方向，项目沿主轴从左至右排列</p>
<p>column：主轴为竖直方向，项目沿主轴从上至下排列</p>
<p>row-reverse：主轴水平，项目从右至左排列，与row反向</p>
<p>column-reverse：主轴竖直，项目从下至上排列，与column反向</p>
<table>
<thead>
<tr>
<th><a target="_blank" rel="noopener" href="https://imgse.com/i/xJ2jj1"><img src="https://s1.ax1x.com/2022/10/09/xJ2Rpj.png" alt="xJ2jj1.png"></a></th>
<th><a target="_blank" rel="noopener" href="https://imgse.com/i/xJ2jj1"><img src="https://s1.ax1x.com/2022/10/09/xJ2jj1.png" alt="xJ2jj1.png"></a></th>
</tr>
</thead>
</table>
<p>2、flex-wrap</p>
<p>默认情况下，item排列在一条线上，即主轴上，flex-wrap决定当排列不下时是否换行以及换行的方式，可能的值nowrap(默认)|wrap|wrap-reverse</p>
<p>nowrap：自动缩小项目，不换行</p>
<p>wrap：换行，且第一行在上方</p>
<p>wrap-reverse：换行，第一行在下面</p>
<p><a target="_blank" rel="noopener" href="https://imgse.com/i/xJRuE8"><img src="https://s1.ax1x.com/2022/10/09/xJRuE8.md.png" alt="xJRuE8.md.png"></a></p>
<p>3、flex-flow</p>
<p>是flex-direction和flex-wrap的简写形式，如：row wrap|column wrap-reverse等。默认值为row nowrap，即横向排列 不换行。</p>
<p>4、justify-content</p>
<p>决定item在主轴上的对齐方式，可能的值有flex-start（默认），flex-end，center，space-between，space-around。当主轴沿水平方向时，具体含义为</p>
<p>flex-start：左对齐</p>
<p>flex-end：右对齐</p>
<p>center：居中对齐</p>
<p>space- between：两端对齐</p>
<p>space-around：沿轴线均匀分布</p>
<p><a target="_blank" rel="noopener" href="https://imgse.com/i/xJRlCQ"><img src="https://s1.ax1x.com/2022/10/09/xJRlCQ.md.png" alt="xJRlCQ.md.png"></a></p>
<p>5、align-items</p>
<p>决定了item在交叉轴上的对齐方式，可能的值有flex-start|flex-end|center|baseline|stretch，当主轴水平时，其具体含义为</p>
<p>flex-start：顶端对齐</p>
<p>flex-end：底部对齐</p>
<p>center：竖直方向上居中对齐</p>
<p>baseline：item第一行文字的底部对齐</p>
<p>stretch：当item未设置高度时，item将和容器等高对齐</p>
<p><a target="_blank" rel="noopener" href="https://imgse.com/i/xJR8vn"><img src="https://s1.ax1x.com/2022/10/09/xJR8vn.md.png" alt="xJR8vn.md.png"></a></p>
<p>6、align-content</p>
<p>该属性定义了当有多根主轴时，即item不止一行时，多行在交叉轴轴上的对齐方式。注意当有多行时，定义了align-content后，align-items属性将失效。align-content可能值含义如下（假设主轴为水平方向）：</p>
<p>flex-start：左对齐</p>
<p>flex-end：右对齐</p>
<p>center：居中对齐</p>
<p>space- between：两端对齐</p>
<p>space-around：沿轴线均匀分布</p>
<p>stretch：各行将根据其flex-grow值伸展以充分占据剩余空间</p>
<p><a target="_blank" rel="noopener" href="https://imgse.com/i/xJRJuq"><img src="https://s1.ax1x.com/2022/10/09/xJRJuq.md.png" alt="xJRJuq.md.png"></a><br><a target="_blank" rel="noopener" href="https://imgse.com/i/xJRYD0"><img src="https://s1.ax1x.com/2022/10/09/xJRYD0.md.png" alt="xJRYD0.md.png"></a></p>
</article><div class="post-copyright"><div class="post-copyright__author"><span class="post-copyright-meta">文章作者: </span><span class="post-copyright-info"><a href="https://gitee.com/dmf-c/blog">dmf</a></span></div><div class="post-copyright__type"><span class="post-copyright-meta">文章链接: </span><span class="post-copyright-info"><a href="https://gitee.com/dmf-c/blog/2021/03/05/css_file/flex/">https://gitee.com/dmf-c/blog/2021/03/05/css_file/flex/</a></span></div><div class="post-copyright__notice"><span class="post-copyright-meta">版权声明: </span><span class="post-copyright-info">本博客所有文章除特别声明外，均采用 <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" target="_blank">CC BY-NC-SA 4.0</a> 许可协议。转载请注明来自 <a href="https://gitee.com/dmf-c/blog" target="_blank">dmf的个人博客</a>！</span></div></div><div class="tag_share"><div class="post-meta__tag-list"></div><div class="post_share"><div class="social-share" 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